<template>
    <div class="header">
        <div class="slogan">
            <p>老男孩IT教育 | 帮助有志向的年轻人通过努力学习获得体面的工作和生活</p>
        </div>
        <div class="nav">
            <ul class="left-part">
                <li class="logo">
                    <router-link to="/">
                        <img src="../assets/img/head-logo.svg" alt="">
                    </router-link>
                </li>
                <li class="ele">
                    <span @click="goPage('/free-course')" :class="{active: url_path === '/free-course'}">免费课</span>
                </li>
                <li class="ele">
                    <span @click="goPage('/actual-course')" :class="{active: url_path === '/actual-course'}">实战课</span>
                </li>
                <li class="ele">
                    <span @click="goPage('/light-course')" :class="{active: url_path === '/light-course'}">轻课</span>
                </li>
            </ul>

            <div class="right-part">
                <div v-if='!username'>
                    <span @click="put_login">登录</span>
                    <span class="line">|</span>
                    <span @click="put_register">注册</span>
                </div>
                <div v-else>
                    <span>{{username}}</span>
                    <span class="line">|</span>
                    <span @click="logout">注销</span>
                </div>
                <!--                                                               @go就是子组件穿过来的事件-->
            </div>
            <Login v-if="is_login" @close="close_login" @go="put_register" @loginsuccess="login_success"/>
            <Register v-if="is_register" @close="close_register" @go="put_login"/>

        </div>
    </div>


</template>

<script>

    import Login from "./Login";
    import Register from "./Register";

    export default {
        name: "Header",

        data() {
            return {
                //sessionStorage浏览器对象的变量和浏览器无关，代表本地数据库（可永久存储）
                //需要什么直接点，即可拿到  ||代表等号
                //Session Storage 代表临时存储，只要浏览器页面一关数据就没有了
                url_path: sessionStorage.url_path || '/',
                is_login: false,
                is_register: false,
                token: '',
                username: '',
            }
        },
         methods: {
            goPage(url_path) {
                // 传入的路由如果不是当前所在路径，就跳转
                if (this.url_path !== url_path) {
                    this.$router.push(url_path);
                }
                sessionStorage.url_path = url_path;
            },
            put_login() {
                this.is_login = true;
                this.is_register = false;
            },
            put_register() {
                this.is_login = false;
                this.is_register = true;
            },
            close_login() {
                this.is_login = false;
            },
            close_register() {
                this.is_register = false;
            },
            login_success(){
                this.username=this.$cookies.get('username')
                this.token=this.$cookies.get('token')
            },
            logout(){
                //清除cookie
                this.$cookies.remove('token')
                this.$cookies.remove('username')
                //把两个变量值为空
                this.username=''
                this.token=''
            },
        },
        created() {
            sessionStorage.url_path = this.$route.path;
            this.url_path = this.$route.path;

            //当页面一创建，我就去cookie中取token和username
            this.username = this.$cookies.get('username')   //取到就有值，取不到就为空
            this.token = this.$cookies.get('token')   //取到就有值，取不到就为空
        },
        components: {
            Login,
            Register
        }


    }


</script>

<style scoped>
    .header {
        background-color: white;
        box-shadow: 0 0 5px 0 #aaa;
    }

    .header:after {
        content: "";
        display: block;
        clear: both;
    }

    .slogan {
        background-color: #eee;
        height: 40px;
    }

    .slogan p {
        width: 1200px;
        margin: 0 auto;
        color: #aaa;
        font-size: 13px;
        line-height: 40px;
    }

    .nav {
        background-color: white;
        user-select: none;
        width: 1200px;
        margin: 0 auto;

    }

    .nav ul {
        padding: 15px 0;
        float: left;
    }

    .nav ul:after {
        clear: both;
        content: '';
        display: block;
    }

    .nav ul li {
        float: left;
    }

    .logo {
        margin-right: 20px;
    }

    .ele {
        margin: 0 20px;
    }

    .ele span {
        display: block;
        font: 15px/36px '微软雅黑';
        border-bottom: 2px solid transparent;
        cursor: pointer;
    }

    .ele span:hover {
        border-bottom-color: orange;
    }

    .ele span.active {
        color: orange;
        border-bottom-color: orange;
    }

    .right-part {
        float: right;
    }

    .right-part .line {
        margin: 0 10px;
    }

    .right-part span {
        line-height: 68px;
        cursor: pointer;
    }
</style>



























































